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Inability to hold urine after a back injury can relate to irritation of the spinal nerves. This should improve with rest and anti-inflammatory medication. It can also be related to degeneration of the spinal disks. This is best evaluated with an MRI.
If you aren't better in a couple of weeks, you should see a spinal specialist. Physical therapy or an injection of steroid to relieve inflammation may be in order.
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In a young person the cartilaginous disks between the vertebra of the spine allow the back to move in all directions, and provide some height as well as flexibility. As a person ages, these disks start to shrink and may lose some of their integrity. You’ve heard of people getting a little shorter as they get older. That is due to the shrinking of the disks.
Most people over 30 will show some signs of degeneration but they may not have symptoms. Only a minority will go on to develop back pain.
Nerves can be irritated if there is swelling in the area, which puts pressure on them, resulting in pain and/or tingling and numbness. Depending on which vertebrae are involved it can also cause temporary loss of bowel and bladder control. As the swelling decreases, so does the irritation and control is regained. This can take a period of weeks.
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Yes, it is usual. It takes some time for the blood to get near enough to the surface to show as a bruise. It will also take some time for the bruise to gradually fade. Usually in 3 weeks or so the majority of it will be gone, but for bad bruises, you may still notice some discoloration for up to several months.
Any type of soft cushion that takes the pressure off the coccyx while sitting will help with the discomfort. You are right, there are dozens on the market, and there isn't a lot of difference in them. It's the principle that counts. You want something that allows you to sit with the pressure on your buttocks while the coccyx remains free.